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GenaCL600 [577]
3 years ago
14

The James family hosted an independent day party they expected 70 gusts but 7 times fewer showed up how many phone attend the pa

rty
Mathematics
1 answer:
Finger [1]3 years ago
5 0

Answer:10 people

Step-by-step explanation:

7 times less showed up so, 70 divided by 7 is 10. 10 guests attended.

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A professor receives, on average, 24.7 emails from students the day before the midterm exam. To compute the probability of recei
MaRussiya [10]

Answer:

Let X the random variable that represent the number of emails from students the day before the midterm exam. For this case the best distribution for the random variable X is X \sim Poisson(\lambda=24.7)

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The best answer for this case would be:

C. Poisson distribution

Step-by-step explanation:

Let X the random variable that represent the number of emails from students the day before the midterm exam. For this case the best distribution for the random variable X is X \sim Poisson(\lambda=24.7)

The probability mass function for the random variable is given by:

f(x)=\frac{e^{-\lambda} \lambda^x}{x!} , x=0,1,2,3,4,...

And f(x)=0 for other case.

For this distribution the expected value is the same parameter \lambda

E(X)=\mu =\lambda

And for this case we want to calculate this probability:

P(X \geq 10)

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